Electrical doorlock



April 1 1924. 1,488,692

- I w. D. LUTZ ELECTRICAL DOORLOCK Filed Jan. 29 1921 3 Sheets-Sheet 1 nnnnnnnnn'nknnnnnn.

amvewtoz lm/cums @QXMW 3 William JZLZ'ZZZ,

W. D. LUTZ April 1', .1924.

ELECTRICAL DOORLOCK Filed Jan. 29 1921 5 Sheets-Sheet 2 wuwto z VVZZZiamDLuZz,

April 1 1924. 1,488,692

' w. D. LUTZ ELECTRICAL DOORLOCK Filed Jan. 29. 1921 3 Sheets-Sheet 5- lt atented Apr. l, 1924.

. A1. ema l ll ll ll ethal rarest crate ELECTRICAL DOOBLOCK.

Application filed January 29, 1921. Serial No. 440,888.

To all whom it may concern:

Be it known that I. VVILLIAM D. Lora, a citizen of the United States, residing at Allendale. in the county of Bergen and State of New Jersey, have invented a new -and useful Electrical Doorlock, of which the following is a specification.

- he present invention relates to electrical door locks, and more particularly to door loclrs for elevator systems. It comprehends, briefly, an improved form of lock which is applicable both to swinging and to sliding doors, without entailing substantial changes in the construction, and which, when employed with doors of the swinging); type, may be made in duplicate as to certain of its component parts, so as to be capable of use in connection with double doors. When used with single doors of the swinging type, it may be applied with equal facility to either right-hand or left-hand doors; that i to say, to doors whose closing movements take place either toward toe right or toward the left.

fficcordingto the invention, there is preferably comprised in the improved look a sliding bolt which is movable into and out of a lock case attached to the door frame and into which the electrical lead wires extend. During the closing of the door, the bolt actuates a contact lever which is shifted tluu'eby into a position in which it closes the electrical circuit this contact lever being constructed in special manner and carrying a specially constructed and mounted contact plate for coaction with the contacts in the loclr case. Thereafter, the circuit remains closed until the bolt is subsequently withdrawn, at which time the movement of the bolt pulls the contact lever and its plate in a direction away from the case contacts.

The invention, as described above, is capable of being installed in private residences, as well as in apartments, office buildlugs and the like; and in such instance it is preferably equipped with mechanism which acts to automatically prevent the door from being; unlocked until the car arrives at a landing and while the circuit is closed.

An embodiment of the invention is illus trated in the accompanying drawings; but while such embodiment may be regarded for all present purposes as preferred, it is to be understood that no limitation to its precise structural details is contemplated excepting as may beimposed by the terms of the appended claims, as the invention is clearly susceptible of modifications and changes within the scope of the claims. Parts and features of the invention may also be utilized separately without other parts, and in other and different environments.

In said drawings:

Figures 1 and 2 are, respectively, a front elevation and a part-sectional end elevation of a single-door lock constructed in accordance with the invention, the cover of the lock case being omitted in Fig. 1 to disclose the interior mechanism;

Figure 3 is a front elevation of a doubledoor lock;

Figure 4 is a vertical section on line l4, Fig. 3;

Figs. and 6 are, respectively, a front elevation and a part-sectional plan view of a slightly-modified construction which is designed for residence-type elevators; and

Fig. i is a vertical section on line 7--7, F 5.

Referring); ll'lO'l'C particularly to the drawings, 10 indicates in a general manner the bolt member of the lock, and 11 the loch case. The latter element is attached to the top of the door frame not shown) in line with. or close to, the free vertical of the door, and is provided with a removable cover plate 127 The bottom of the case has an opening 13 formed therethroug'h to admit the enlarged upper end or head 14: of the bolt 10. which is arranged vertically and is slidably mounted in openings provided in a of spaced guides 15 fori'ned on a base plate 16 which, in turn, fastened to the door. Tee stem of the bolt is encircled by an expansible spring 17, which tends to force it upward and which bears at opposite ends against the under side of the enlarged head 14- and the upper side of the lower guide 15, such movement being limited by a cross-pin 18 carried by the aforesaid head 14: for coaction with the upper guide. Withdrawal of the bolt against the action of spring 17 is eflected by means of a chain, rod or analogous operating device (not shown) which is connected to the split lower end 19 of its stem.

The bolt head. 14 is designed to enter the case opening 13 at the completion of the closing nioven'ient of the door, as will be ruined by means of :1 pair of crosspins of this .icd l end 4-1 of the understood; and during the course movement lL is depressed on. stif e"; agaii. the case, Whether the door he of ti swinging or of the sliding type. it first instance, the opening 13 is ez-ztcndet through met do the back of the case anl is heieled at its and, hence, is

upper edge, as ii dicated 52 (Figure i ctuel pa comthe front face 0 the bolt he" 0 this e the sonic those spending bevel colts are employed s or cirstance, the two omitted and one provided with :1, tion 22. For co; ,i and instulletirni l i i and are or in so that the letter 251 type of door. Ti that end of the edge that is, door moves in in l whi i single left-hand lock The movement case is utilized to ing the electric ciin,

of'which enter to. illnsing in one end then H 1 r x 1 parts, which encloses saic wire 'i l I switch place by a screw V nto the posiconneoted at their terni'nsls side of Fig. carried l it assumes one s to b re .26 to which is carrled by e ioteg lescrihed with re):-

W :1 P i 28 which are fined to e. hloch it is with 29 faced opposite side "toly before the door is strips 30,121 bloc: and its when the do 1 is shut, asheing SUlt-lZlY fasten d to i is of the swin ino type, the case. The aforeshid niicanite stri i1 oess 'cn 'h the at opgosite of the hlocl: 521 will as SJOVfil ii Fig. channels or uid] wires are particularly an 20 of suit. holt viii he manner, ELiCl some up it the door The (innit-(lo 'no or sn' c they the hesohvl feewhich is actuated or the holt. pro; c mz'iiinst the hck'clwl of 21 16 i end he freed down long the ho toin of no opening 173 said openi7. holt heed s end will side of the bod} lever 81, and will nnwnrd during hook 31" on said k recess in the tact pest 8 to '2 mm. the holt in propost 39 is encircled on a coil spr r l osition. lever swings in)- yieldingly presses the plate my I i 7 it eerries the block 37 and per portion 41 oi said post 3' i j :ctet through :1 slot 42 in the plate an i duccd in size, so that the plate both of rocking and of moving v seid post, its normal position bei parts increm nt t act plate 38 will and hr: lee the two contact termi- Q7 and 28, t c parts then occupying i sented in Fig. 1 and a ill) essons he lcf.-haud side of Fig. 3. Where a closed. inc operation is precisely the same derrril l, the context termiengaged and bridged by the movement of the door; and since the contacts 28 and 28 are integral, this bridging of the last. lined contact-s will have the effect of closing the circuit.

li ii'h 1 ierence to the pairs of cross-pins and cm. ad by the posts 89 and 39, it will be observed that one pin of each pair located slightly higher than the other. In ionscqueacc. when either switch lever is in its inactive or down position, its contact plate will assume a slightly inclined position relative to the upper face of the corresponding insulating block 37 or 37. This is for the purpose of enabling the plate, just before it reaches the con tacts 27 and 28 (or 28 and 2. to assume a position ezzactlji parallel with the under faces of said contacts, so that it will strike both of them simultaneously, the result be ing a double or two-point make and break of the circuit, which is of advantage.

The circuit-breaking operation is, of course, the reverse of the operation above described; that is to say, the bolt is withdrawn by means of its associated operating element, and the switch lever or switch thereupon drops, thus breaking the circuit, the bolt head ultimately passing out of the opening.

It will be observed that the bolt exerts a positive pull upon the switch lever during its descent, due to the interlocking engagement between the parts 34-. and 35, which insures the downward movement of said lever and. hence, the breaking of the circuit, the parts becoming disengaged just before the top of the bolt head passes through opening 13. In the double-lock construction, the two switch levers are reversely arranged, and the two recesses 8 and 35 in the bolt heads are formed in the outer edges thereof.

The construction illustrated in Figs. 5 to 7 is designed primarily for use in connection with elevators installed in private residences, and is assumed to be applied to a single sliding door. The bolt 44 therein represented is pivoted horizontally at one end on a pin or stud 4-5 provided on a plate 46, and is formed with a central vertical loop 47 through which a second pin 48 on said plate projects. The opposite end of the bolt is formed with a nose or hook 49, and beneath said hook with a finger 50, the parts 49 and 50 being spaced apart by a recess 51. A

at the conclusion of the spring employed to normallyhold the bolt in 'sed position, said spring being arranges within the loop and hearing at opposite ends against the top of the loop and the pin 4.8.

The hook end of the bolt is designed to and project through an opening 53 rm-ed in the adjacentwall of the case 5 1, ie edge of said opening being beveled as for (reaction with the beveled edge 56 of the hook, so that during the entrance of he bolt it will first be depressed and will then snap up into locking position, as will he uncerstood from Fin. The bolt'is C) 't'lized to shift a switch lever 57 into circunz-closing position, as in the forms previously described, such lever having a general angular s go and comprising two diverging arms 58 and 59, at the intersection of which it is pivoted on a pin 60 fixed in the case. The arm 59 is adapted to enter the recess 51 when the bolt and moves into and through the opening 53, the resultbeing that the switch lever is caused to swing in a clockwise.

direction. The outer portion of the arm 58 carries an insulating block 61 to which is fixed a post "2 carrying a spring-pressed con tact plate these parts being identical in construction, mounting and operation with the corresponding parts in the preceding forms. Plate 63 serves to bridge a pair of spaced contact terminals 64 connected to an insulating block 65 which is faced on opposite sides with inicanite strips 66, the two contacts 64. being equipped with binding posts to which the terminals of the line wires not shown) are attached. The line wires enter the case through an opening in the top wall thereof, and will preferably be enclosed in a pipe or tube, as in th first form, their arrangement within the case being generally similar to that represented in Fig. 1.

i i leans are provided in connection with this form of the invention for preventing the unlocking of the door until the car reaches a landing. Accordingly, there is journalled in the lock case a horizontal rock shaft 67, to which is fixed a catch or dog 68. This dog or catch is arranged within the case immediately below the finger or projection 50 of the bolt, said finger having a notch or seat 69 formed in its under face. As shown in 7 the dog is stepped, its upper step or portion. 70 having about half the width of its lower or body portion or step 71; and a spring 72 is associated with. said. dog to normally force it inward to a position directly beneath the bolt. If the dog is rocked part way only by the spring, its narrow upper step 70 will. be brought in line with the seat 69, so that a slight downward movement of th bolt will still be permitted, such movement being sufficient to rock the switch lever leftward so as to break the circuit, but insufiicient to disengage the hook 49 from the as, 1, t$8,6s2

adjacent wall of the case, so that the door remains locked. But it the dog moves all the way in, then the top of its said step will he brought beneath and into immediate proximity to the unrecessed portion of the projection 50 and downward movement of the bolt will be completely prevented, the

switch lever consequently maintaining its closed position. The dog is rocked backward (count r-clockwise in Fig. 7 against the tension of its spring by the action of a vertical arm 73, which is lined to the rock shaft 6? and carries a roller 74 at its'tree The operation will be understood from the foregoing without further explanation, it being only necessary to state that the looking and circuit-closing operations occur simultaneously at the completion of the closing of the door, the latter remaining locked so long as the parts continue in circuit-closing position and until tne car has reached a landing. The depression of the bolt, however, breaks the circuit, its hook L9 pressing down upon the arm 59 ot the switch lever and thus torcing it to rock about its pivot 60 in a direction to separate the contact plate 63 from the contacts 64, the arrangement of the crosspins carried by the post 62 enabling the plate to disengag both contacts 64 at the same time.

I claim as my invention z 1. In a lock for electric elevators, the combination of a case having a bolt opening, a pair of spaced contacts in the case to which the line wires are connected, a switch in said case for bridging said contacts to close the linecircuit, a bolt, and a part on which the bolt is mounted, said bolt, while the case and said part remain in a fixed relative position, being movable from a position outside of and tree from the case, through said opening into position to operate said switch and to lock said part to the case.

2. In a lock for electric elevators, the combination of a case having a bolt opening, a pair of spaced contacts in the case to which the line wires are connected, a switch in said case for bridging said contacts to close the line circuit, a bolt, and a part on which the bolt is mounted, said bolt, while the case and said part remain in a fixed relative position, being movable from a position outside or" and clear of the case,

through said opening into position to engage said switch and positively force it into contact-bridging position, the bolt when in said last mentio 1 position being ope dive to lock said part to the case.

In a lock for ele trio elevators, the con'ibipation of a case having a bolt opening, a pair oi spaced contacts in the case to which the line wires are connected, aswitch in said case for bridging said contacts to close the line circuit, a switch arni carrythe switch, a bolt "ion outside of and tree om the case,

A into position to en- 1 said switch a and move it to circlosing position, maid bolt having a re- 1 adjacent its front end, and a hook on nvitch rm moved into said recess by "itch arm and tormconnection between the operable to insure the fore the bolt is ing an interloclqin switch arm and bolt, line circuit being o cned be withdrawn.

In a lock for electric elevators, the combination o1. a case having a bolt opena pair of spaced contacts in the case to which the line wires are connected, a switch in said case for bridging said contacts to close the line circuit, a bolt movable from a position outside of and tree from the case. through said opening into position to engage and positively operate said switch, a d bolt and switch having interlocking ts brought into interlocking engagement r said operation of the switch after the bolt has moved into the case and operable to prevent the withdrawal of the bolt from the case without the line circuit being opened.

5. In a lock for electric elevators, the combination of a case having a bolt opening; a pair of spaced contacts in the case to which the line wires are connected; pivotally-inounted switch lever in said case; an insulated post carried thereby and provided with a pair of cross-pins, one of which is located nearer the free end or" the post than the other; a contact plate for bridging said contacts loosely mounted on said post beneath said pins; a spring encircling said post and bearing against said plate to force the same against said pins, whereby said plate is maintained parallel with the surfaces of said contacts at the times of making and breaking contact therewith so as to engage and disengage said surfaces simultaneously; and a bolt movable through said opening into position to operate said lever.

6. In a lock for electric elevators, the combination of a case having a bolt opena pair of spaced contacts in the case to which the line wires are connected; a switch lever pivoted in said case for movement into contact-bridging position to close the line circuit; a bolt movable from apomovable from a po nasaeea tion whereby the bolt, on being withdrawn,

will pull said lever away from said contacts before the bolt has cleared the case.

7. In a lock for electric elevators, the combination of a case having a bolt opening; a pair of spaced contacts in the case to which the line wires are connected; a switch lever pivoted in said case for movement into contact-bridging position to close the line circuit; bolt movable from a position outside of and free from the case, through said opening into position to operate said lever, said bolt having a recess in its front end; and a projection on said lever moved into said recess by the switch closing movement of the switch lever, whereby said bolt, on being withdrawn, will pull said lever away from said contacts before the bolt has cleared the case.

8. ln a lock for el ctric elevators, the combination of a case having a bolt opening; an insulating block mounted in the case and faced on opposite sides with inicanite strips. said strips projecting at opposite sides beyond said block to form receiving channels for the line wires; a pair of spaced cont-acts to which the line wires are connected disposed against one of said micanite strips and fastened to said block; a switch mounted in said case for bridging said contacts to close the line circuit; and a bolt movable from a position outside of and free from the case, through said opening into position to operate said switch.

t. In a lock for double-door electric elevators, the combination of a case having a pair of bolt openings; two pairs of spaced contact-s mounted in a row in said case, the two inner contacts being connected together to pass the current from one pair to the other, and the two outer contacts having the line ii'ires attached to them; a pair of switches, one for bridging each pair of contacts, movably mounted in said case; and a air bolts movable through said open o operate said switches, each bolt betachable to one of the elevator doors. In locl elevators, the'con'ibination or" a case having a pair of bolt openings; two pairs of spaced contacts mounted in a row in said case, the two inner contacts being connected together to pass the current from one pair to the other, and the two outer contacts having the line wires attachec to them; a pair of switches, one for bridging each pair of contacts, movably mounted in said case; and a pair of bolts movable through said open-- ings to operate said switches, each bolt being attachable to one of the elevator doors, and each switch automatically moving away from its associated pair of contacts when the corresponding bolt is withdrawn.

Signed at New York, in the county of New York, and State of New York, this 21 day of Jan, 1921.

WILLIAM D. LUTZ,

for double-door electric 

